Draft: Add DNG tags up to version 1.6.0.0 and some TIFF/EP tags and update documentation
Amend MR !337 (closed) 'Add support for DNG tags up to version 1.6.0.0 and some TIFF/EP tags' from Sami Liedes:
- Set most tags to OkToChange=1.
- Define BATTERYLEVEL tag as ASCII and convert values of rational variant to ASCII.
- TIFF documentation updated for tags recognized by LibTiff (DNG 1.6 and others).
- TIFF/EP tags added, which are equivalent to EXIF tags.
- Definition of tags reformatted (clang-format off) for better readability of tag comments in tiff.h and tif_dirinfo.c
This addresses part of #418 as well.
Edited by Su Laus